Is tuna good for weight loss?
Yes. Three ounces of light tuna in water has about 73 calories and 16.5 grams of protein. Which can to buy, how much is sensible given mercury, a recipe, 11 more meal ideas and the 7 mistakes to skip.
Is tuna good for weight loss?
Quick answer
Yes. Three ounces of light tuna canned in water has about 73 calories and 16.5 grams of protein, with about 90% of its calories coming from protein. It needs no cooking, and it keeps in the pantry, so it's there when plans fall apart.
Three things make tuna useful for weight loss, and each comes with a catch worth knowing.
According to USDA data, 100 grams of canned light tuna in water has 86 calories and 19.4 grams of protein. You'll often see those numbers quoted for a 3-ounce serving, but 3 ounces is 85 grams, which works out to about 73 calories and 16.5 grams of protein. About 90% of those calories come from protein.
Tuna is low in calories because it's low in fat to begin with, and water-packed options add none. Why does this matter? Reviews of higher-protein diets link them with better appetite control and, in calorie-restricted diets, more fat lost and more lean mass kept. Tuna can help you hit your protein target, which the National Academy of Sports Medicine puts at about 0.73 grams per pound of body weight during weight loss, without taking a big bite out of your calories.
Compare it with another lean favorite. Three ounces of roasted chicken breast has about 140 calories and 26 grams of protein, so chicken actually brings more protein per serving. Calorie for calorie, tuna has a small edge: 20 grams of protein costs about 88 calories from tuna and about 106 from chicken.
Plenty of weight loss plans fail because of preparation, not knowledge. You're starving, nothing's ready and suddenly that drive-through looks really appealing. Tuna handles that moment well.
Canned tuna keeps for a long time, so check the best-by date on your can and stock your pantry accordingly. With a dozen cans on the shelf, you always have protein 60 seconds away. There's no defrosting chicken overnight and no stopping at the store. Open a can, drain it and add it to a salad or whole-grain bread. The best diet is the one you can stick to, and that kind of convenience helps.
Pouches are even easier: no can opener needed, less liquid to drain and simple to toss in a work bag or gym bag.
Weight loss shouldn't require a premium grocery budget. At $1 to $2 for a can, tuna is an inexpensive way to get protein, and fresh fish at $10 to $15 or more a pound makes that plain. Prices vary by store and region, so use these as a rough guide.
You'll sometimes read that tuna beats almost anything on protein per dollar. It doesn't beat chicken. A 5-ounce portion gives you about 28 grams of protein, so at those prices you're paying about 4 to 7 cents a gram. Raw chicken breast at $3 to $5 a pound gives you about 100 grams of protein, or about 3 to 5 cents a gram. Tuna's real advantage is that it's already cooked. And in fairness, a can of tuna is far cheaper than any prepared meal, including ours.
Which type of tuna is best for weight loss?
Quick answer
Light tuna canned in water is the best default. It has about 73 calories per 3 ounces, the lowest average mercury of the common types, and an FDA Best Choice rating. Albacore and yellowfin carry nearly three times as much mercury.
Tuna types differ for both weight loss and safety. Calories and protein below are for 3 ounces, from USDA. Mercury is FDA's average in parts per million, and the FDA categories come from its advice about eating fish, where one serving is 4 ounces for adults.
| Type of tuna | Calories | Protein | Average mercury | FDA category | FDA serving guide |
|---|---|---|---|---|---|
| Light, canned in water | About 73 | 16.5 g | 0.126 ppm | Best Choice | 2 to 3 a week |
| Light, canned in oil, drained | About 168 | 25 g | 0.126 ppm | Best Choice | 2 to 3 a week, higher calories |
| Albacore or white, canned in water | About 109 | 20 g | 0.350 ppm | Good Choice | 1 a week |
| Yellowfin (ahi), cooked | About 111 | 25 g | 0.354 ppm | Good Choice | 1 a week |
| Bigeye | No USDA entry | No USDA entry | 0.689 ppm | Choice to Avoid | Not recommended |
Types of tuna compared, per 3 ounces
The FDA's mercury table doesn't separate canned light tuna by what it's packed in, so the oil row uses the same average.
Fish is an important part of a healthy diet, partly for its omega-3 fats. The Dietary Guidelines for Americans recommend at least 8 ounces of seafood a week on a 2,000-calorie diet. Fish, including tuna, can also expose you to mercury, which is why FDA and EPA publish advice for the people most at risk: those who might become or are pregnant or breastfeeding, and children aged 1 to 11.
Under that advice, canned light tuna is a Best Choice, at 2 to 3 servings a week. Albacore is a Good Choice, at 1 serving a week. It's one or the other, not both in the same week. The [mercury section below](#mercury-safety) has the details.
This is where many people misjudge their tuna. Oil-packed tuna tastes richer and has a better texture, but even after draining, it holds on to oil. A 5-ounce portion of water-packed tuna has about 120 calories, and the same weight of drained oil-packed tuna has about 280.
You do get more protein from the oil-packed version, so the fairest comparison is by protein. Twenty grams of protein costs about 88 calories from water-packed tuna and about 136 from oil-packed. Labels vary by brand, so check yours.
If you love oil-packed tuna, use it occasionally and measure portions carefully. For regular weight loss meal prep, water-packed is the better pick, and the flavor difference matters less once you're mixing it with other ingredients.
What should you look for when buying tuna?
Quick answer
Reach for chunk light tuna in water as your default. It's usually skipjack, with lower mercury and fewer calories than albacore. If you're watching sodium, look for low-sodium or no-salt-added versions, since regular cans run about 210 milligrams per 3 ounces.
Walking down the canned fish aisle can be overwhelming, with dozens of options, confusing labels and big price differences. Here's what to look for.
For weight loss meal prep, buy the budget-friendly options in bulk. Save the premium ones for when you actually care about the texture, since most tuna gets mixed with other ingredients anyway.
If you're eating tuna 2 to 3 times a week, that's about 8 to 12 cans a month. When canned tuna goes on sale, stock up and keep a dedicated tuna shelf, with the oldest best-by dates at the front.
How do you make tuna work for weight loss?
Quick answer
Drain it well, measure any mayo and add volume with vegetables. Mayo is the big one: a tablespoon has about 94 calories. Swapping 2 tablespoons for nonfat Greek yogurt saves about 170 calories and still gives you a creamy tuna salad.
The difference between tuna helping or hurting your weight loss comes down to preparation.
Replace mayonnaise with plain nonfat Greek yogurt, or use a 50/50 mix of mayo and yogurt. Two tablespoons of regular mayo is about 190 calories, and 2 tablespoons of nonfat Greek yogurt is about 20. That's about 170 calories saved, and it's closer than you'd expect once you add mustard, lemon juice and seasonings.
Here's a go-to option for a tasty tuna salad:
Total: about 150 calories for a big, satisfying portion, against 350 calories or more for a traditional tuna salad with mayo. A 5-ounce can holds less than 5 ounces once drained, so your real number may be a little lower.
These add a lot of flavor for few or no calories:
What's a filling tuna recipe for weight loss?
Quick answer
This Mediterranean tuna bowl takes about 25 minutes and serves one. It has about 540 calories, 41 grams of protein and 8 grams of fiber, from tuna, quinoa, chickpeas, vegetables and feta. It's a big lunch, so make it your main meal.
Prep time: 10 minutes. Cook time: 15 minutes. Total time: 25 minutes. Serves: 1.
Rinse 1/4 cup quinoa in a fine-mesh strainer. Combine with 1/2 cup water in a small pot. Bring to a boil, reduce to a simmer, cover and cook for 12 to 15 minutes until the water is absorbed. Fluff with a fork and let cool while you prep the other ingredients.
Wash and dry the greens and vegetables. Halve the cherry tomatoes. Dice the cucumber. Drain and rinse the chickpeas.
In a large bowl or meal prep container, arrange the mixed greens as your base. Top with the cooked quinoa on one side and the drained tuna on another. Next, arrange the cherry tomatoes, cucumber and chickpeas around the bowl.
In a small bowl or jar, whisk together the olive oil, lemon juice, oregano and a pinch of salt and pepper. Taste and adjust the seasoning.
Drizzle the dressing over the bowl. Sprinkle with feta and add olives, if using. Toss right before eating, or keep the components separate for meal prep and dress them right before eating so the greens stay crisp.
Nutrition per serving, with about 8 grams of fiber, estimated from USDA FoodData Central, without the olives. USDA's file has no entry for mixed greens, so spinach stands in for them.
What are good tuna meals under 500 calories?
Quick answer
Try tuna-stuffed avocado at about 340 calories, a Nicoise-style bowl at about 445, a spicy rice bowl at about 410, a tuna melt at about 430 or lettuce wraps at about 310. Each starts with 5 ounces of water-packed tuna.
Variety helps you stick with a plan. Here are five different ways to use tuna, each under 500 calories for a full meal. Numbers are estimated from USDA FoodData Central with nonfat Greek yogurt. USDA's file has no mixed greens or Dijon, so spinach and yellow mustard stand in for them.
What's in it: 1/2 avocado, 5 ounces water-packed tuna mixed with 2 tablespoons Greek yogurt and diced tomatoes, and 1 cup mixed green salad with balsamic vinegar, cherry tomatoes and cucumber.
Why it works: the fat in the avocado and the protein in the tuna make for a filling combination. It feels indulgent, and it's a good lunch that requires no cooking.
What's in it: 5 ounces water-packed tuna, 1 cup green beans, 3 baby potatoes (about 2 ounces each), 1 hard-boiled egg, mixed greens and cherry tomatoes, and a 1-teaspoon olive oil and Dijon dressing.
Why it works: it's a complete meal, with protein from tuna and egg and carbs and fiber from the vegetables. It looks like something from a restaurant, too.
What's in it: 5 ounces water-packed tuna mixed with 1 tablespoon sriracha "mayo" (sriracha stirred into Greek yogurt), 3/4 cup cooked brown rice, 1 cup steamed broccoli, shredded carrots and cucumber, sliced green onions and a sprinkle of sesame seeds.
Why it works: the Asian-inspired flavors keep it interesting, and the vegetables make it a huge, filling bowl.
What's in it: 2 slices whole-grain bread, 5 ounces water-packed tuna mixed with 1 tablespoon Greek yogurt and Dijon mustard, 1 slice cheddar cheese and a side salad with balsamic vinegar.
Why it works: this one satisfies comfort food cravings while staying in your calorie budget. Toast it in a pan with cooking spray instead of butter to save calories.
What's in it: 5 ounces tuna mixed with 2 tablespoons hummus, in 4 to 5 large romaine leaves with 1/4 cup diced tomatoes, 1/4 cup cucumber, 2 tablespoons feta, 1/4 cup chickpeas and lemon wedges.
Why it works: protein and fiber keep you satisfied, and the lettuce wrap format makes it fun to eat. It's a good fit for a lower-carb day.
Looking for more variety without the cooking? Our Weight Loss Meal Plan delivers portion-controlled, chef-cooked meals, and our High Protein Meal Plan adds 2 extra ounces of meat per meal.
How do you keep tuna salad from getting boring?
Quick answer
Change the mix-ins and keep the base. These 6 variations all start with 5 ounces of drained water-packed tuna and run about 150 to 240 calories before the serving suggestion, from dill to curry to avocado-lime. Bread or pasta adds more.
Standard tuna salad gets old fast. Each of these uses the same base of 5 ounces drained water-packed tuna, with a different flavor profile. Calories cover the tuna and mix-ins, so the serving suggestions add extra. USDA's file has no Dijon, kalamata olives, roasted red peppers or rice vinegar, so those are our estimates.
| Variation | Mix-ins | Serve it | Calories |
|---|---|---|---|
| Dill | 2 tablespoons Greek yogurt, 1 teaspoon Dijon, 1 teaspoon lemon juice, 1/4 cup diced celery, 1/4 cup diced cucumber, 1 tablespoon fresh dill, salt, pepper | On whole-grain crackers, in lettuce wraps or on greens | About 150 |
| Mediterranean | 2 tablespoons Greek yogurt, 1 tablespoon lemon juice, 1/4 cup diced tomatoes, 2 tablespoons diced red onion, 2 tablespoons crumbled feta, 4 chopped kalamata olives, oregano, garlic powder | In a whole-wheat pita with cucumber slices | About 240 |
| Curry | 2 tablespoons Greek yogurt, 1 teaspoon curry powder, 1 teaspoon honey, 2 tablespoons diced apple, 2 tablespoons diced celery, 1 tablespoon raisins, a pinch of cayenne | On whole-grain bread or in a spinach salad | About 205 |
| Avocado-lime | 1/4 avocado, mashed, juice of 1 lime, 2 tablespoons diced red onion, 2 tablespoons cilantro, 1 teaspoon jalapeño (optional), salt, cumin | In corn tortillas or on a black bean salad | About 220 |
| Italian | 1 teaspoon olive oil, 1 tablespoon red wine vinegar, 1/4 cup diced roasted red peppers, 2 tablespoons diced red onion, 1 tablespoon capers, Italian herbs, garlic powder | Tossed with whole-grain pasta or on bruschetta | About 180 |
| Asian-inspired | 2 tablespoons Greek yogurt, 1 teaspoon sesame oil, 1 teaspoon rice vinegar, 1 teaspoon low-sodium soy sauce, 1/4 cup shredded carrots, 2 tablespoons sliced green onions, 1 teaspoon grated ginger, sesame seeds | Rolled in nori with cucumber or over mixed greens | About 215 |
6 tuna salad variations with 5 ounces of tuna
Which tuna mistakes stall weight loss?
Quick answer
The biggest is the mayo: 4 to 5 tablespoons adds about 375 to 470 calories to a batch. Others include eating albacore daily, skipping vegetables, logging oil-packed tuna like water-packed, ignoring sodium and serving sizes and making tuna your only protein.
Here are some common mistakes people make when adding tuna to a weight loss meal plan, and how to avoid them.
The mistake: using 4 to 5 tablespoons of regular mayonnaise in a batch of tuna salad. That's about 375 to 470 calories from mayo alone, far more than the tuna itself.
The fix: use Greek yogurt or a 50/50 mix of mayo and Greek yogurt. If you stick with regular mayo, use actual measuring spoons and cap it at 2 tablespoons per 5-ounce can. Add moisture with lemon juice, pickle juice or a small amount of the tuna liquid.
The mistake: buying albacore because it tastes better, then eating it every day. In FDA testing, canned albacore averaged about three times the mercury of canned light tuna, at 0.350 against 0.126 parts per million.
The fix: make light tuna your default, and save albacore for once a week at most. Rotate with other proteins like chicken, salmon, shrimp and legumes for a broader range of nutrients.
The mistake: eating just tuna, with no vegetables. You're hitting your protein goal, but you're missing the fiber and volume that help you feel full.
The fix: aim for 1 to 2 cups of vegetables with every tuna meal. Add diced vegetables directly to tuna salad, serve tuna on a big salad or pair it with roasted vegetables.
The mistake: using oil-packed tuna, draining it and logging it as if it were water-packed. Even well-drained, it holds on to oil and has about 168 calories per 3 ounces, against about 73.
The fix: if you prefer oil-packed, log it accurately from the label. Or switch to water-packed and add 1/2 teaspoon of olive oil yourself, for about 20 controlled calories.
The mistake: eating regular canned tuna daily without counting the sodium. By USDA numbers, 5 ounces has about 350 milligrams. Add salt, bread, crackers and other components, and one meal can pass 1,000 milligrams.
The fix: buy low-sodium or no-salt-added tuna when you can, and season it yourself with lemon, herbs, pepper and garlic powder. This matters most if you have blood pressure concerns.
The mistake: assuming the nutrition facts apply to the whole can. Some cans have more than one serving, so you may think you're eating 70 calories when you're eating double.
The fix: check whether the serving size covers the whole can or a portion, and do the math. When meal prepping, weigh your tuna after draining if you want precision.
The mistake: finding out tuna works for weight loss, then eating it for lunch and dinner every single day. That raises your mercury exposure for no good reason and narrows your nutrients.
The fix: having tuna 2 to 3 times a week is plenty. Rotate it with chicken, turkey, lean beef, eggs, Greek yogurt, cottage cheese, tofu, legumes and other fish like salmon or cod. For more fish-based ideas, read our guides to salmon for weight loss and shrimp for weight loss.
How much tuna is safe to eat each week?
Quick answer
FDA advice for pregnancy, breastfeeding and children lists canned light tuna at 2 to 3 servings a week, or albacore at 1. A serving is 4 ounces for adults. FDA sets no separate limit for other adults, but it's a sensible guide.
Yes, tuna and other fish contain mercury. That doesn't mean you need to avoid fish, only that it pays to choose well and rotate.
The FDA and EPA advice sorts fish into three groups based on mercury: Best Choices, Good Choices and Choices to Avoid. Canned light tuna, including skipjack, is a Best Choice. Albacore and yellowfin are Good Choices. Bigeye is a Choice to Avoid.
That advice is written for those who might become or are pregnant or breastfeeding, and for children aged 1 to 11, the people most vulnerable to mercury. For them, a pregnancy or breastfeeding serving is 4 ounces, and children's servings run from 1 ounce at age 1 to 3 up to 4 ounces at age 11, at 2 servings a week from the Best Choices list.
It doesn't set a limit for other adults, so "2 to 3 servings is safe for every adult" goes further than the advice does. We still think it's a sensible guide for anyone eating tuna regularly.
According to the EPA, the amount of methylmercury in a fish depends on what it eats, how long it lives and how high it sits in the food chain. Levels are generally highest in large fish that eat other fish. That fits the tuna numbers: FDA's averages run from 0.126 parts per million in canned light tuna to 0.689 in bigeye.
Individual cans vary, too. FDA's canned light tuna samples ranged from below detection to 0.889 parts per million. A study of three brands of canned tuna bought in Las Vegas found significant differences between brands, with white tuna averaging about 0.6 parts per million and chunk light about 0.14. That's one more reason to rotate your proteins instead of counting on any single can.
For most adults trying to lose weight, eating light tuna 2 to 3 times a week fits comfortably within FDA's guidance for its most sensitive groups, and you get real nutrition from it. The key is variety. Rotate tuna with chicken, eggs, other fish and plant proteins, so you keep the convenience without leaning on one fish.
How do you make tuna part of your plan?
Quick answer
Buy water-packed light tuna, swap the mayo for Greek yogurt, add vegetables and stick to 2 to 3 servings a week alongside other proteins. Start with 6 cans and one recipe. If cooking is the sticking point, that's a separate problem.
Tuna deserves a regular place in your weight loss plan. With about 16.5 grams of protein and 73 calories per 3 ounces of water-packed light tuna, it's an efficient way to build meals that satisfy hunger. It needs no cooking and no thawing, so you always have a high-protein option when you'd otherwise say you have nothing healthy to eat.
The approach is simple: choose water-packed light tuna as your default, limit albacore to once a week, use Greek yogurt instead of mayo, load up on vegetables and stick to 2 to 3 servings a week while rotating other lean proteins.
If you're giving meal prep a go on your own, start small. Buy 6 cans of water-packed light tuna this week. Try the Mediterranean tuna bowl or the Greek yogurt tuna salad above, and see how easy it is to hit your protein goals without complicated cooking. Add it to your rotation with chicken, eggs, salmon or shrimp, and you've built an approach that doesn't require perfection, only consistency.
There's no food that melts fat. The goal is to find nutritious options you enjoy that make a calorie deficit feel manageable. For many people, tuna fits: it's affordable, convenient and tasty when prepared right.
If the hard part is execution rather than knowledge, though, a can opener won't fix that. Our Weight Loss Meal Plan is portion-controlled, macro-balanced and built by a registered dietitian. It arrives frozen and heats in a few minutes, from $89.95 for 10 meals. If you want more protein per meal, our High Protein Meal Plan adds 2 extra ounces of meat, for about 10 more grams of protein, from $63 for 6 meals.
Make it easy withWeight Loss Meal PlanFrom $89.95View plan
Questions about tuna, answered
Yes. It's one of the more protein-dense foods you can buy, with about 90% of its calories coming from protein. Three ounces of water-packed light tuna has about 16.5 grams of protein and 73 calories. Canned tuna also needs no cooking and keeps in the pantry, which makes a plan easier to stick to.
Water-packed light tuna is the best default. It has fewer calories than albacore, at about 73 per 3 ounces, and the lowest average mercury of the common types, so FDA lists it as a Best Choice. It's typically the most affordable, too. Albacore is fine occasionally, but light tuna should be your go-to.
FDA advice for pregnancy, breastfeeding and children lists 2 to 3 servings of canned light tuna a week, or 1 serving of albacore, with an adult serving at 4 ounces. That means about 8 to 12 ounces of light tuna. FDA sets no separate limit for other adults, so it's a sensible guide. Ask your healthcare provider for personal advice.
Water-packed is the better pick because it has fewer calories. Three ounces has about 73 calories, and the same weight of drained oil-packed tuna has about 168, though with more protein. For 20 grams of protein, that's about 88 against 136 calories. Unless you strongly prefer the taste of oil-packed, choose water-packed.
We wouldn't. Eating it daily goes well past the 2 to 3 servings a week in FDA's advice for its most sensitive groups, and it adds mercury exposure you don't need. Eating the same protein daily also limits variety. Rotate light tuna with lean proteins like chicken, turkey, eggs, other fish and legumes.
Replace regular mayonnaise with nonfat Greek yogurt, which saves about 170 calories per 2 tablespoons, or use a 50/50 mix. Add volume with diced celery, cucumber and bell peppers. Season with lemon juice, Dijon mustard, herbs and spices. For more fiber, serve it on whole-grain bread or a big salad, not white bread or crackers.
Yes, tuna contains mercury, and levels vary a lot by species. In FDA testing, canned light tuna averaged 0.126 parts per million, so it's listed as a Best Choice at 2 to 3 servings a week. Canned albacore averaged 0.350, about three times as much, and is a Good Choice at 1 serving a week.
Mostly, yes. Canned tuna keeps its protein, and light tuna has less mercury on average than fresh yellowfin. Fresh tuna has much less sodium, so choose a low-sodium can if that matters. By USDA numbers, cooked yellowfin has more protein per ounce. Canned wins on cost and convenience, which helps you stick to a plan.
Keep reading
Sources
On this page
Ellie Lopez, LDN, MS · Dec 16, 2022
Tina Sassine, RD, MPH · Oct 9, 2026